...All the cut off dates call for is notification that a particular offer is ending on a certain day, affording the impression that the reader will miss out if they don't purchase now, an age-old and well-used, however effective, means of pushing home additional sales.
If utilizing this technique, utilize the language that demonstrates that your low price and your particular offer is only guaranteed till a certain date, this way if you decide to continue to a later date it doesn't cause a stir, and you are able to avoid utilizing those little java codes that push the date forward every day relating to the computer clock time at the visitors end.